XR not starting on iOS

[meditation-error]

I was trying out the WebXR part of the viewer, but I ran into a problem wit AR on iOS (IPhone 15 pro)

I am using the WebXR Firefox viewer and examples like these work as they should:

https://threejs.org/examples/webxr_ar_lighting.html https://threejs.org/examples/webxr_ar_cones.html https://threejs.org/examples/webxr_ar_hittest.html

(from this issue: https://github.com/mkkellogg/GaussianSplats3D/issues/127)

But when using this repository (0.4.7), nothing happens when I click the 'Start AR' button. The following example I found online also doesn't work on my phone (not sure if this uses the latest version of GaussianSplats3D):

https://projects.markkellogg.org/threejs/gaussian_splats_3d_demos/vr.html

Everything works as expected on android.

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Edit: I added some alerts to try to see what's going wrong:

In ARButton class button.onclick before calling: navigator.xr.requestSession('immersive-ar', sessionInit).then(onSessionStarted)

alert('navigator.xr' + navigator?.xr)
alert('requestSession' + navigator?.xr?.requestSession)

onSessionStarted first line alert('onSessionStarted ' + session)

the first 2 alerts show expected values ([Object Object] and full requestSession function), but the onSessionStarted alert never shows up

Now when I press the button again, navigator.xr is suddenly undefined

• I also tested on an ipad, with the same results.

• When I replace the ARButton class in gaussian-splats-3d-module.js with the original 'three/addons/webxr/ARButton.js' button it also does nothing.

[ramaramx]

AR support only on Android. webXR you need third party to use that

maybe you can use variant launch i was use that then works

[meditation-error]

Thank you for the suggestion, it's still weird that the three.js examples above do work on ios using the webXR browser but the splat scenes's do not.

I am trying Variant Launch right now, but the 'Start AR' button still doesn't do anything on my page.

When I generate a QR for: https://projects.markkellogg.org/threejs/gaussian_splats_3d_demos/vr.html or https://threejs.org/examples/webxr_ar_lighting.html

I see: 'WebxXr not available' as the button

But when I goto https://demos.launchar.app/ and scan the QR, the three.js example there does work correctly.

So unfortunatly I am still missing something...

Do I need to add the script to my page ? I tried, but I got the famous cors errors, so I copied the source and added the script locally, but it doesn seem to do anything)